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Origin and vertical variation of the bound fatty acids in core sediments of Lake Dianchi in Southwest China

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Abstract

Based on the molecular distribution of bound fatty acid (BFA) compound classes in core sediments of Lake Dianchi combined with the compound-specific δ13C values of the straight-chain BFAs, origin and vertical changes of organic matters in the sediments were investigated. The results indicated a significant change of BFA sources over the past 700 years. Contrast to the low concentrations of the terrestrial BFAs, the abundance of BFAs derived from the plankton/bacteria in the top sections (1944–recent) was more than 80 %. The increasing proportions of the branched and unsaturated BFAs in total fatty acids were closely correlated with the heavy eutrophication and the frequent algal blooms in the decades. Furthermore, the positive shift of δ 13C of C16 and C18 (~2 ‰) in the upper section might be an indicator of the excess phytoplankton productivity. However, it was found that the plankton/bacteria-derived BFAs were more easily degraded during the early diagenetic process. The special compound carbon isotopic compositions of the long straight-chain BFAs (C24 and C26) in the sediments showed a depletion of heavier δ 13C values (ca. −30 ‰) in the midsections (1559–1787), reflecting a relatively growing contribution of C3 plants to C4 plants or that C4 plant growth was inhibited in cold and arid climates during the period.

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Acknowledgments

This work was supported by the Natural Science Foundation of China (NSFC) (grant nos. 41103082 and 40903051). We are most grateful to Tian Lin (State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences) for his invaluable advices and comments in finalizing the manuscript.

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Correspondence to Fengchang Wu.

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Responsible editor: Zhihong Xu

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Wang, L., Wu, F., Xiong, Y. et al. Origin and vertical variation of the bound fatty acids in core sediments of Lake Dianchi in Southwest China. Environ Sci Pollut Res 20, 2390–2397 (2013). https://doi.org/10.1007/s11356-012-1122-7

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Keywords

  • Origin
  • Vertical variation
  • Bound fatty acid
  • Compound-specific δ13C
  • Core sediment
  • Lake Dianchi